[Lochlin]

Regarding the electric fuel pump conversion, check out the sticky on top of the HD forum called "Fuel Draw". It has a lot of info there to include how to install the electric.

The oil injection is a simple fix. Simply snip the oil line going from the oil tank to the carb and plug it with a screw.

The voltage regulator is grounded via one of its three wires and I don't believe that the actual VR housing itself needs grounded. Either way, the VR is only used for the battery charging process and doesn't have anything to do with a cart's performance.

Your coil shouldn't be bouncing around so definitely fix it. As you seem to be getting spark I have some doubts that it is the root cause of your issue.

Really, your symptoms seem to be fuel draw related. Check out that other sticky and for a starting point.